The circulatory system brings nutrients and oxygen to the digestive system. Also the circulatory system takes wastes away from the digestive system. The digestive system carrys the nutrients through the cells. and that is what I think
The digestive system works with all of the systems in your body. To be more specific it works with the urinary, muscular, and the nervous system really work with the digestive system. Another is the circulatory system, it helps get the harvested nutrients to the other parts of your body.
A system is a group of organs that work together like the digestive system. While a body is a group of systems that work together. You are not just your digestive system but also your musculoskeletal system, urogenital system, endocrine system and nervous systems that work all together.